std::basic_string::operator[] in C++

Returns a reference to the character at specified location pos. No bounds checking is performed. If pos > size(), the behavior is undefined.

Syntax :

reference operator[] (size_type pos);
const_reference operator[] (size_type pos) const;
Parameters :
pos - position of the character to return
Return value :
Reference to the requested character
Exceptions :
No exception is thrown

/* CPP program to access
   a character through
   std::basic_string::operator[] */
#include <iostream>

//Driver code
int main()
{
    //String with valid indices from 0 to 2
    std::string str = "abc";

    //Printing size of string
    std::cout << "string size = " << str.size() << '\n';

    //Accessing element at index 2
    std::cout << "Element : " << str[2];
}

Output

string size = 3
Element : c